The finale of the Spanish season could be disrupted after the country's football federation said it intended to suspend all competitions over a dispute with government.
The RFEF said it would "suspend competitions of all categories starting from May 16 indefinitely."
This would throw into doubt the penultimate round of La Liga fixtures, due to take place the following day.
The wrangle involves a new law introduced to regulate the sale of television rights.
The RFEF said it was acting after three months of unsatisfactory talks, but added that they remained "open to dialogue" with the government.
If there is no resolution, the crucial title clash between Barcelona and Atletico Madrid on May 17 and the domestic cup final on May 30 could be among 30,000 games affected.
At the moment, Spanish clubs can negotiate their own TV deals.
But in an apparent attempt to end the stranglehold of Barcelona and Real Madrid, the Spanish government wants all clubs to negotiate collectively - just as they do in England's Premier League.
In another twist, the AFE players' union has threatened to strike over being excluded from the negotiations.
Barcelona star Lionel Messi is backing the threat.
"The AFE have met with us," he said. "The players are with them in what they say."
